Sink basin



FIG. 1 is a top, front, left perspective view of an embodiment of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top, front, left perspective view of another embodiment of the claimed design;

FIG. 9 is a front elevation view thereof;

FIG. 10 is a rear elevation view thereof;

FIG. 11 is a left side elevation view thereof;

FIG. 12 is a right side elevation view thereof;

FIG. 13 is a top plan view thereof;

FIG. 14 is a bottom plan view thereof;

FIG. 15 is a top, front, left perspective view of another embodiment of the claimed design;

FIG. 16 is a front elevation view thereof;

FIG. 17 is a rear elevation view thereof;

FIG. 18 is a left side elevation view thereof;

FIG. 19 is a right side elevation view thereof;

FIG. 20 is a top plan view thereof; and,

FIG. 21 is a bottom plan view thereof.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings show portions of the article that form no part of the claimed design. Broken lines formed by equal length dashes show unclaimed subject matter. Broken lines formed by unequal length dashes (i.e., dash-dot) define bounds of the claimed design. Broken away symbols having a jagged element show that no particular length of the portion is claimed, and further; the space between said lines forms no part of the claimed design. Portions of the claimed design having line shading and stipple shading define contrasting surfaces. 

CLAIM We claim the ornamental design for a sink basin, as shown and described. 